U-Haul International Inc., North America's largest trailer rental company with more than 17,000 outlets, implemented the policy Dec. 22, saying it can no longer afford to defend the lawsuits, The Detroit News reported in Thursday editions.

"U-Haul has chosen not to rent behind this tow vehicle based on our history of excessive costs in defending lawsuits involving Ford Explorer towing combinations," the company told the newspaper, adding that the move is "not related to safety issues."

Joanne Fried, a U-Haul spokeswoman, declined to disclose how much the Phoenix-based company has spent defending lawsuits involving Explorers.

"The decision is not based on one accident," she said. "It's based on several different lawsuits going on for several years."

"This is all about runaway litigation and trial lawyers forcing businesses to make unfortunate decisions for fear of lawsuits," he said.

U-Haul was involved in a lawsuit that Bridgestone/Firestone settled out of court in September. It involved three college students who were injured when their Firestone-equipped Explorer overturned while pulling a U-Haul trailer.

Bridgestone/Firestone is currently trying reach an agreement on a $149 million settlement of 30 class-action lawsuits because of defective tires.

Although federal regulators have said there isn't enough evidence to show that the Explorer model contributed to the tire defects, many of the problem tires were equipped on Explorers.